Clock



FIG. 1 is a front view of one embodiment of the clock.

FIG. 2 is a back view of the clock.

FIG. 3 is a side view of the clock.

FIG. 4 is a side view of the clock.

FIG. 5 is a bottom of the clock; and,

FIG. 6 is a top view of the clock.

The broken line showings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a clock, as shown and described. 